[Openmp-dev] Build is terribly slow on Arm

[Itaru Kitayama via Openmp-dev]

Why do you think I build in Debug? I try to
avoid that all time.

On Wed, Jun 10, 2020 at 18:38 Jonas Hahnfeld <hahnjo at hahnjo.de> wrote:

> You should not use Debug build to compare the performance of compilers.
> As you're targeting different architectures, you might run into
> different checks in the two backends. I believe it's possible this is
> triggered by OpenMP code generation which might hit some corner cases.
> This could also happen in Release builds, but might be less probable.
>
> Also keep in mind that AArch64 (which you're probably talking about in
> the context of HPC) now uses GlobalISel in some configurations. I don't
> remember if it's with or without optimizations (or maybe even both
> nowadays?), but you can try to deactivate this on the command line to
> rule out this area.
>
> Regards
> Jonas
>
> Am Dienstag, den 09.06.2020, 08:12 +0900 schrieb Itaru Kitayama via
> Openmp-dev:
> > They were both Debug build, but it took 20-25 minutes to finish on Arm.
> >
> > On Tue, Jun 9, 2020 at 7:50 AM Itaru Kitayama <
> > itaru.kitayama at gmail.com
> > > wrote:
> > > My OpenMP offloading app builds within a minute or so on
> > > x86, but the same app takes longer than 5 minutes on Arm.
> > > How do I investigate this further, supplying -v and post
> > > the log here?
>
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